1# Linker Script for National Semiconductor's CRX-ELF32. 2 3# The next line should be uncommented if it is desired to link 4# without libstart.o and directly enter main. 5 6# ENTRY=_main 7 8test -z "$ENTRY" && ENTRY=_start 9cat <<EOF 10 11/* Example Linker Script for linking NS CRX elf32 files. */ 12 13/* The next line forces the entry point (${ENTRY} in this script) 14 to be entered in the output file as an undefined symbol. 15 It is needed in case the entry point is not called explicitly 16 (which is the usual case) AND is in an archive. */ 17 18OUTPUT_FORMAT("${OUTPUT_FORMAT}") 19OUTPUT_ARCH(${ARCH}) 20${RELOCATING+EXTERN(${ENTRY})} 21${RELOCATING+ENTRY(${ENTRY})} 22 23/* Define memory regions. */ 24MEMORY 25{ 26 rom : ORIGIN = 0x2, LENGTH = 3M 27 ram : ORIGIN = 4M, LENGTH = 10M 28} 29 30/* Many sections come in three flavours. There is the 'real' section, 31 like ".data". Then there are the per-procedure or per-variable 32 sections, generated by -ffunction-sections and -fdata-sections in GCC, 33 and useful for --gc-sections, which for a variable "foo" might be 34 ".data.foo". Then there are the linkonce sections, for which the linker 35 eliminates duplicates, which are named like ".gnu.linkonce.d.foo". 36 The exact correspondences are: 37 38 Section Linkonce section 39 .text .gnu.linkonce.t.foo 40 .rdata .gnu.linkonce.r.foo 41 .data .gnu.linkonce.d.foo 42 .bss .gnu.linkonce.b.foo 43 .debug_info .gnu.linkonce.wi.foo */ 44 45SECTIONS 46{ 47 .init : 48 { 49 __INIT_START = .; 50 KEEP (*(.init)) 51 __INIT_END = .; 52 } > rom 53 54 .fini : 55 { 56 __FINI_START = .; 57 KEEP (*(.fini)) 58 __FINI_END = .; 59 } > rom 60 61 .jcr : 62 { 63 KEEP (*(.jcr)) 64 } > rom 65 66 .text : 67 { 68 __TEXT_START = .; 69 *(.text) *(.text.*) *(.gnu.linkonce.t.*) 70 __TEXT_END = .; 71 } > rom 72 73 .rdata : 74 { 75 __RDATA_START = .; 76 *(.rdata_4) *(.rdata_2) *(.rdata_1) *(.rdata.*) *(.gnu.linkonce.r.*) *(.rodata.*) 77 __RDATA_END = .; 78 } > rom 79 80 .ctor ALIGN(4) : 81 { 82 __CTOR_START = .; 83 /* The compiler uses crtbegin.o to find the start 84 of the constructors, so we make sure it is 85 first. Because this is a wildcard, it 86 doesn't matter if the user does not 87 actually link against crtbegin.o; the 88 linker won't look for a file to match a 89 wildcard. The wildcard also means that it 90 doesn't matter which directory crtbegin.o 91 is in. */ 92 93 KEEP (*crtbegin.o(.ctors)) 94 KEEP (*crtbegin?.o(.ctors)) 95 96 /* We don't want to include the .ctor section from 97 the crtend.o file until after the sorted ctors. 98 The .ctor section from the crtend file contains the 99 end of ctors marker and it must be last */ 100 101 KEEP (*(EXCLUDE_FILE (*crtend.o *crtend?.o) .ctors)) 102 KEEP (*(SORT(.ctors.*))) 103 KEEP (*(.ctors)) 104 __CTOR_END = .; 105 } > rom 106 107 .dtor ALIGN(4) : 108 { 109 __DTOR_START = .; 110 KEEP (*crtbegin.o(.dtors)) 111 KEEP (*crtbegin?.o(.dtors)) 112 KEEP (*(EXCLUDE_FILE (*crtend.o *crtend?.o) .dtors)) 113 KEEP (*(SORT(.dtors.*))) 114 KEEP (*(.dtors)) 115 __DTOR_END = .; 116 } > rom 117 118 .data : 119 { 120 __DATA_START = .; 121 *(.data_4) *(.data_2) *(.data_1) *(.data) *(.data.*) *(.gnu.linkonce.d.*) 122 __DATA_END = .; 123 } > ram AT > rom 124 125 .bss (NOLOAD) : 126 { 127 __BSS_START = .; 128 *(.bss_4) *(.bss_2) *(.bss_1) *(.bss) *(COMMON) *(.bss.*) *(.gnu.linkonce.b.*) 129 __BSS_END = .; 130 } > ram 131 132/* You may change the sizes of the following sections to fit the actual 133 size your program requires. 134 135 The heap and stack are aligned to the bus width, as a speed optimization 136 for accessing data located there. */ 137 138 .heap : 139 { 140 . = ALIGN(4); 141 __HEAP_START = .; 142 . += 0x2000; __HEAP_MAX = .; 143 } > ram 144 145 .stack : 146 { 147 . = ALIGN(4); 148 . += 0x6000; 149 __STACK_START = .; 150 } > ram 151 152 .istack : 153 { 154 . = ALIGN(4); 155 . += 0x100; 156 __ISTACK_START = .; 157 } > ram 158 159 .comment 0 : { *(.comment) } 160 161 /* DWARF debug sections. 162 Symbols in the DWARF debugging sections are relative to the beginning 163 of the section so we begin them at 0. */ 164 165 .debug_aranges 0 : { *(.debug_aranges) } 166 .debug_pubnames 0 : { *(.debug_pubnames) } 167 .debug_info 0 : { *(.debug_info .gnu.linkonce.wi.*) } 168 .debug_abbrev 0 : { *(.debug_abbrev) } 169 .debug_line 0 : { *(.debug_line) } 170 .debug_frame 0 : { *(.debug_frame) } 171 .debug_str 0 : { *(.debug_str) } 172 .debug_loc 0 : { *(.debug_loc) } 173 .debug_macinfo 0 : { *(.debug_macinfo) } 174} 175 176__DATA_IMAGE_START = LOADADDR(.data); 177EOF 178